I'm not sure about that. These days in the backend you need a lot of libraries for cloud providers and new databases/services. For example, is there a Common Lisp library for AWS/Azure/Google cloud? Is there one for Clickhouse?
Clickhouse doesn't have an official CL client but they have a CLI, TCP and HTML interfaces, C++ interface, etc... all listed on their website. It's not that hard to connect to an API without a library.
But yes, there's more Java/Python/Go/Ruby/JS stuff pre-built than Common Lisp. But you'll also find more CL stuff out there than almost any esoteric language, probably because it's easy to build stuff in CL.
I suspect doing the same in CL would be similarly simple.
[0] https://github.com/cognitect-labs/aws-api